Internal-combustion engine



March 6, 1928. 1,661,557

E. R. BURTNETT r INTERNAL COMBUSTION ENGINE Filed Jan.8, 1925 of the character referred to, wherein the Patented Mar. 6, 1928.

UNITED STATES PATENT OFFICE.

EVERETT R. BURTNETT, OF LOS ANGELES, CALIFORNIA, ASSIGNOR, BY DIRECT AND MESNE ASSIGNMENTS, TO THE AUTOMOTIVE VALVES CO., OF LOS ANGELES, GALI- FORNIA, A VOLUNTARY TRUST. I

INTERNAL-COMBUSTION ENGINE.

Application filed January 8, 1925. Serial No. 1,176.

My invention relates generally to internal vection of the heat that is developed with in said chamber; to provide a construction common clearance chamber is connected to the head ends of the adjacent piston chambers by short throats, that are spaced apart so as to provide a cooling fluid circulation space between and entirely around them; further, to arrange the spark plug receivingv lug between the wall of one of the throats and the outer wall of the head structure so that said lug is entirely surrounded by a cooling fluidcirculation chamber and, further, to form the underside of the bottom portion of the wall of the common clearance chamber so as to preclude the possibility of formation and lodgment of steam or air bubbles on the underside of said common clearance chamber.

Withthe foregoing and other objects in view, my invention consists in certain novel features of construction and arrangement of parts that will be hereinafter morefully described and claimed and illustrated in the accompanying drawings in which:

Fig. 1 is a horizontal section taken through the center of the common compression and combustion clearance chamber.

Fig. 2 is a vertical section taken on a longitudinal plane through the center ofthe head of a cylinder block and which head is provided with the common compression and combustion clearance chamber contemplated by my invention.

Fig. 3 is a cross section taken on the line 3-3 of Fig. 2.

Referring by numerals to the accompanying drawings, 10 designates a cylinder block having formed therein, a pair of combustion chambers 11 and arranged for operation within said'chambers are pistons 12.

Thewalls of block 10 are formed with connected cells or chambers 10 through which is a fluid cooling medium, such as water is adapted to circulate and these cells or chambers communicate directly. with cells 'or chambers 13 that are formed in the cylinder head 14. 1

Directly above the pair of chambers 11, head 14 is formed with an upwardly projecting mound-shaped portion 15, the wall of which is provided with a cell or chamber 16 that communicates with cell or chamber 13.

At the top of fmember15, this cell or chamber 16 is provided with an outlet 17, to which may culation duct (not shown).

be connecteda suitable cir- Formed in member 15 is a substantially spherical chamber 18 and leading down wardly therefrom are short throats or ducts 19 and 20 that communicate directly with the head or inner ends of chambers 11."

These throats are spaced apart, thereby providing a narrow cooling fluid circulation duct or'space 21 between them.

Inasmuch as chamber- 18 spherical in form, the under surface of the lower portion thereof, curves upwardly in all directionsfrom a: central point, consequently there are no flat faces on which air or steam bubbles might collect and form an objectionable heat insulating area.

By arranging the outlet 17 at the top of is substantially chamber 16, the flow of cooling fluid is in a general upward direction through chambers 10 and 16, and this action assists materially in counteracting any tendency of air or steam bubbles to form and collect on the rounded underside of the wall surrounding chamber18.

Formed between the inner and outer walls of members 15 and preferably at a point above throat 20, the latter being in communication with the chamber 11 that is pro vided with gaseous fuel inlet ports, is a wall 22 having a threaded aperture that receives a spark plug 28. This lug is encompassed by cooling fluid circulation chamber 13.

It will be understood that as the pistons 12 travel upward in their respective chambers 11, a charge of gaseous fuel admitted into their power stroke.

Inasmuch as common clearance chamber 18, throats 19 and lug 20 are encompassedby cooling fluid circulation chambers, the connection of heat from said chamber'and throats will be comparatively rapid and, due to the rounded contour of the undersurface of thelower portion of the wallsurrounding the common clearance chamber, the formation of; heat insulating gas and air bubbles on said umlersurface is ell'eetually prevented.

Obviously, the size, form and constructionv of the common clearance chamber as herein described, may be modified in certain details without departing from the spirit of the-invention, the scopeof which is set forth in the appended claims;

I claim as my invention:

1; In an internal combustion engine, theconibination with a pair of combustion cylinders, the axes of which are parallel, of a head closing the inner ends of the combustion chambers, a common compression and combustion clearance chamber formed in said head inwardly from the surface thereof that is applied to the head ends of the cylinders which common clearance chamber is spherical in form, short parallel ducts formed in said head and connecting the common clearance space with the combustion chambers, the axes of which ducts are parallel with the axes of the combustion chambers, one of which ducts communicates directly with the lower portion of the common clearance chamber the other duct being offset with respect to the'c'ominon clearance chamber so that its upper portion communi' cates directly with the endofsaid*common clearance chamber and the greatest width of the spherical chamber being substantially greaterthan the widths of the ducts that connectsaid chamber with the combustion chambers.

2. In an internal combustion engine, the combination with a pair of combustion cylinders, the axes of which are parallel of a headclosing tlie inner ends ofthe com ustion chambers, a common compression and combustion clearance chamber formed in' said head inwardly from the surface thereof that is applied to the'head'ends oi the cylinno ders which common clearance chamber is spherical in form, short parallel ducts formed in said head and conneetingthe'com mon clearance space with the combustion chambers, the axesof wliicli'diicts are paral-" e5 lel with the axes of the combustion chatn-- bers, one of which ducts communicates" directly with the lowerportion'of theeommon' clearance chamber, the other duct being offset with respect to the common clearance chamber so that its upper portion" communicates directly with the end of said comiilonf clearance chamber the greatest width of said common clearance chamber being substan-- tially greater than the widths of the ducts that connect said common clearance chamher with the combustion chambers and an ignition means seated in the head and projecting into the upper endof th'e ductthat is offset relative'to the common compression and combustion clearance space.-

Intestimony whereof lf'aflix' my signature.

EVERETT R? BURTNETT. 

